AAON RL-240 - Manual (Page 41)

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Figure 20 - Securing Air Volume Band Ends
For single set screw applications, tighten the
set screw to the required torque setting
(Table 8) using a calibrated torque wrench.
For double set screw applications, tighten
one set screw to half of the required torque
setting (Table 8) using a calibrated torque
wrench. Tighten the second set screw to the
full required torque setting then tighten the
first set screw to the full required torque
setting.
Table 8 - Plenum Fan Set Screw Specifications
SET SCREW
DIAMETER
TORQUE (IN-
LBS)
1/4" 80
5/16" 126
3/8" 240
7/16" 384
1/2" 744
9/16" 1,080
5/8" 1,500
3/4" 2,580
7/8" 3,600
1" 5,400
The gap tolerances that are allowed between
the blower and the inlet cone for the RL
plenum fan blowers are shown in Figure 21.
The inlet cone can be moved as necessary to
center the cone in relation to the blower. The
blower can be moved on the motor shaft to
set the correct overlap. These tolerances are
critical to the performance of the blower.
Figure 21 - Plenum Fan Gap Tolerances
Power Return and Exhaust Axial Flow
Fans
Blade Pitch Angle Setting Instructions
Step 1: Determine the new required pitch for
the fan blades
Use the fan program in AAONEcat32
™
.
Step 2: Maintain the balance of fan
Mark the HUB/RET castings across a single
joint, so the fan can be reassembled in the
same orientation.
Mark the location of any balancing weight.
Balancing weight will be on the outer bolt
circle, in the form of washers, and/or longer
bolts, or an additional balancing nut.
Number the blades and blade sockets, so that
they can be replaced into their original
positions.